William schwagermann



W. SCHWAGERMANN.

ELECTRIC CONTROLLING-APPARATUS.

APPLICAHON FILED APR. 24, 1911'.

Patented Aug. 5, 1919.

UNITED STATES PATENT OFFICE- WILLIAM SCHWAGERMANN, OF YONKERS, YORK, ASSIG-NOB. TO WARD LEONARD ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ELECTRIC CONTROLLING APPARATUS.

Specification of Letters Patent.

- Application filed April 24, 1917. serial No. 164,127.

To all whom it may concern:

Be it known that I, WILLIAM SCHWAGER- MANN, a citizen of the United States, residing'at Yonkers, in the county of Westchester and State of New York, have invented certain new and useful Improvements in Electric Controlling Apparatus, of which the following is a specification.

The principal object of my invention is to provide a new and improved device for controlling the output of a variable speed generator. Another object of my invention is to provide a control magnet'with a single armature capable of performing two different functions. Another object of my invention is to provide a control magnet with a single armature adapted under certain circumstances to act as a cut-out, and under other circumstances as a regulator. All these and other objects of my invention will be made apparent in the following specification and claims taken in connection with the accompanying drawings, in which I show one specific embodiment of my invention.

Referring to these drawings, Figure 1 is a diagram showing my improved controlling apparatus in its normal condition when the generator is at rest or running at a speed below a certain critical speed;

Fig. 2 is a diagram showing the closure of the automatic cut-out on the attainment of the critical speed referred to, and

winding goes from the armature 11 to the binding post 16, thence to the back stop 24:, flexible connection 27, armature 20, back contacts 26 and 19, binding post 18 and through the field winding 14:. The back contacts 26 and 19 just mentioned are 1n shunt to the resistance 15 which will be thrown. in

circuit with the field winding 1 1 when those v contacts are opened.

The armature 20 is mounted loosely on the two guides 21 .and 23 and the retractile spring 25 normally holds it against the back stop 24 at one end and against the back a contact 19 at the other end. The spring 25 Patented Aug. 5, 1919.

is connected nearer to the back contact 19 than to the back stop 24 so that the magnetic attraction in the core 13 due to the shunt winding will attract the armature 20 imparting to it a swinging movement pivotlng on the back contact 19. The armature 20 and the core 13 carry cooperating front contacts 28 and 29 adapted to be closed by the movement about the back contact 19 as a pivot. Such a closure establishes a circuit from the armature 11 through the battery 32 traced as follows: 16242728-29 13303132. It will be seen that current through this circuit will energize the series winding 30 and from the binding post 31 the charging current will go to the battery 32 or lamps 33 in paraliel therewith.

When the armature'll is at rest the apparatus is disposed as shown in Fig. 1. As the armature 11 speeds up a current of increaslng intensity issupplied through the shunt coil 12 thus increasing the attraction on the armature 20 in opposition to the spring 25. Eventually, with increasing speed, the attraction becomes so great that the armature 20 is moved to close the contacts 28 and 29, in' this movement pivoting on the back contact 19. The closure of the contacts 28 and 29 closes the load circuit through the battery 32 and lamps 33 and at this stage.

With further increase of speed the increasing current throughthe series-coil 30 will eventually move the armature 20 through a second stage of movement, this time pivoting on the contacts 28, 29 and opening the back contacts 19 and 26. In this second stage of movement, the armature 20 will strike against the front stop 22. The opening of the contacts 19- and 26 will throw the resistance 15' in series with the field winding 14, thus weakening the field and cutting down the output of the armature 11. The resultant reduction of current through the series coil 30 will cause the will build up again and the same cycle ofopening and closing the contacts 19, 26 will be repeated. and so on. Eventually, if the speed of the generator increases sufliciently its output may become great enough through the series coil 30 to hold the armature 2O permanently against the stop 32, as shown in Fig. 3, thus keeping the resistance 15 permanently in series with the field winding 14.

While I have described a single embodiment of my invention in the foregoing specification, it will be evident that various modifications may be made without departing from the invention.

I claim:

1. In combination, a generator, a shunt coil permanently connected across its terminals, a series coil, an armature subject to magnetism developed by either coil, yielding retractile means for said armature, and a stop for the armature when attracted, said stop being adapted to serve as a fulcrum for vibratory movement of the armature.

2. In combination, a generator, a shunt coil permanently connected across its terminals, a series coil, an armature subject to magnetism developed by either coil, yielding retractile means for said armature, and a stop for the armature when attracted, said stop being adapted to serve as a contact for closing the circuit of the series coil and as a fulcrum for further movement of the armature.

3. In combination, a magnet, a transverse armature subject to attraction by said magnet in two stages, and a stop to be e-nga ed at the end of the first stage to serve as a lcrum for the nextstage.

4. In combination, a magnet, an armature subject to attraction by said magnet in two stages, a back contact to serve as a fulcrum for the first stage, and a front contact to be engaged by the armature at the end of the first stage and to serve as a fulcrum for the next stage.

5. In combination, a magnet, an armature, guiding means therefor, a back stop and a back contact, a retractile spring normally engaging said armature therewith, and a front contact and a front stop for the armature.

6. In combination, a generator, a magnet having a winding responsive to the output of the generator, an armature, a retractile spring therefor, one end of the armature being adapted to be drawn against the magnet and the engagement therewith to serve as a fulcrum for movement of the other end of the armature.

7. In combination, a generator with a shunt field winding and a resistance in series therewith, an armature, a retractile spring therefor, a back contact on said armature to shunt out said resistance, shunt and series windings to which said arniature'is subject,

a front contact on the armature to close the circuit of said series winding, and guides for said armature giving it two degrees of freedom whereby when subjected to increasing attraction it will first pivot on said back contact and close the front contact and then pivot on said front contact and open the back contact. 7

8. In combination, a generator, a control magnet therefor, an armature for said magnet, guide means for the armature giving it two degrees of freedom, a back contact and a front contact, and a retractile spring tending to hold the armature against the back contact but disposed so that when subjected to increasing attraction the armature will swing thereon as a pivot and make the front contact and thereafter with increasing attraction it will swing on the front contact as a ivot and break the back contact.

9. In combination, a magnet, an armature therefor, a retractile spring for the armature, said armature having back contacts normally closed and front contacts normally open, said armature being adapted to swing around one pivot when attracted to close the front contacts and thereafter on increased attraction to swing around another pivot to open the back contacts.

10. In combination, a generator, a magnet associated therewith, an armature therefor, a contact on the armature, a cooperating contact, said two contacts being adapted to control the main generator circuit, another contact on the armature, and a contact to coopfor movement of the other end of the armature'.

12. In combination, a generator, a control magnet therefor, an armature for the magnet, one set of contacts in the main generator circuit controlled by angular movement of the armature about: one point, and another set of contacts to regulate the generator output controlled by angular movement of the armature about another point.

13. The method of controlling the output of a generator which comprises pivoting an armature at one end to act as a cutting in switch on the attainment of a certain sufficient voltage and thereafter pivoting it at the other end to act as a vibratory regulator.

14. The method of controlling the output of a generator which comprises subjecting an armature to attraction to cut in the circuit for the generator by a movement about one end as a pivot, and thereafter operating said armature as a vibratory regulator having its pivot at the opposite end.

15. In combination, a horseshoe magnet with a series coil on one side and a shunt cuit thereof, a back stop and a front contact coil on the other side, a transverse armature, at one end, a front stop and a back contact 10 a back stop and a front contact at one end, at the other end and an intermediate retraca front stop and a back contact at the other tile spring, said front contact serving for 5 end and an intermediate retractile spring, an initial cutting in switch and as a pivot 16, In combination, a horseshoe magn t for vibratory regulation, by means of said with a series coil and a shunt coil, a transback contact. verse armature to complete the magnetic cir- WILLIAM SGHWAGERMANN. 

